Public water system · IA5009056
ActiveColfax Water Supply
At a glance
Colfax Water Supply (PWSID IA5009056) is an active community water system in Jasper County, Iowa. It reports serving 2,305 people through 938 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in July 2011.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,305
Service connections
938
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Colfax Water Supply compare with other water systems in Jasper County?
By EPA's size categories, Colfax Water Supply is a small system (501 to 3,300 people). Jasper County has 11 active public water systems, and Colfax Water Supply is the 2nd-largest of them by population served. Its population served is roughly in line with the county average of 2,384 people per system, and accounts for 8.8% of the 26,224 people reported by systems filed under the county. Across Iowa, the 1,828 active systems average 1,718 people each. Nationally, the average active community water system reports serving 6,703 people, so Colfax Water Supply is about 66% below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Iowa has 1,084 active community water systems, 59% of the state's 1,828 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,502 Iowa systems (82%) list groundwater as their primary source.
Who owns and regulates Colfax Water Supply?
EPA lists Colfax Water Supply as owned by a local government. The IA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 9 of the 11 active systems in Jasper County (82%) are also owned by a local government.
Does Colfax Water Supply have drinking water violations?
EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in July 2011. The violations listed here began between March 1994 and July 2011. By type: 8 monitoring and reporting, 2 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 11 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2011-07-01 | Public notice, recordkeeping or otherOperations Report · code 10 | Not reported | No | Resolved |
| 2010-10-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2010-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2010-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2008-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1994-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-03-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 11 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Colfax Water Supply: frequently asked questions
Who runs Colfax Water Supply?
Colfax Water Supply (PWSID IA5009056) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Colfax Water Supply serve?
Colfax Water Supply reports serving 2,305 people through 938 service connections in Jasper County, Iowa.
Where does Colfax Water Supply get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Colfax Water Supply have any drinking water violations?
EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in July 2011. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Colfax Water Supply's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in July 2011. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Colfax Water Supply's water quality report?
As a community water system, Colfax Water Supply must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Jasper County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Newton Water Supply | Jasper | 16,518 | Community | Groundwater |
| Monroe Water Supply | Jasper | 2,007 | Community | Purchased groundwater |
| Prairie City Water Works | Jasper | 1,703 | Community | Groundwater |
| Baxter Water Supply | Jasper | 1,002 | Community | Purchased groundwater |
| Sully Muni Water Works | Jasper | 900 | Community | Purchased groundwater |
| Kellogg Water Supply | Jasper | 617 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Colfax Water Supply, PWSID IA5009056, Iowa”, https://aquacensus.com/water-systems/iowa/colfax-water-supply-ia5009056 (data as of October 1, 2026).